Director Guillermo del Toro (Pacific Rim, Hellboy) posted on Twitter in regards to Ultraman X and a planet named after him.
The critically-acclaimed director tweeted:
By X and Z, the director is referring to Ultraman X and Zero, who fought together in a planet named Guillermo as seen in Ultraman X's 5th episode. Because of this, Tsuburaya, the company behind the Ultraman franchise replied:
For those who are unaware, director Guillermo del Toro is a big Ultraman fan and in a Japanese interview, he revealed that his favorite Ultraman monster is the alien Baltan. You can see the full interview here, in which he talked how Japanese monster films and TV shows influenced Pacific Rim.